Adapter for machine tools



June 7, 1932. A. c. MAXFIELD 1,861,504

ADAPTER FOR MACHINE TOOLS Original Filed July 11, 1929 2&

Mam/inning IN V EN T0 uy/v /lar 67% A TTORNEYS.

' provision l the accompanying Patented June 7, 1932 UNITED STATES PATENT OFFICE ARTHUR G. MAXFIELD, OF GRANSTON,

MANUFACTURING RHODE ISLAND RHODE ISLAND, ASS IGNOB TO BROWN & SHARPE COMPANY, OF PROVIDENCE, RHODE ISLAND,

A. CORPORATION OF ADAPTER FOR MACHINE TOOLS Application filed July 11, 1929, SerialNo. 377,428. Renewed April 23, 1932.

My present invention relates to adapters for machine tools, and has particular reference to adapters for use with milling machines.

One object of my invention is to provide an adapter so constructed that tool shanks mounted therein may be readily removed therefrom.

A second object of my invention is to utilize an adapter which has a socket with anon-sticking taper for receiving tool shanks.

A third object is to provide a positive lock for a tool shank inserted within the adapter.

A fourth object of my invention is the of a floating seat in the adapter to prevent complete seating of the tool shank therein until the locking elements are in lockin alignment.

A fifth object is to utilize the movement of a manually operable cam lock for completing the tool shank seating movement and for locking the tool shank within the adapter.

A further object is to limit the movement of the cam lock between open and locked positions.

Other'objects and advantageous features will'be readily apparent from the detailed description following, in conjunction with drawing, and will be particularly pointed out in the appended claims.

In the drawing, Figure 1 is an assembly view showing the improved adapter positioned in a standard spindle, with a machine tool locked therein;

Figure 2 is a sectional elevation of the adapter;

Figure 3 is asection thereof on the line 3-:3 of Figure 1;

Figure 4: is a perspective view of the locking cam; and V Figure 5 is a section on the line 5-5 of Figure 3, showing the extent of the movement limiting groove.

The adapters heretofore used for holding machine tools of relatively small shank. diameters have had a low pitch taper socket for receiving the tool shank, which is forcedv in with a driving fit. To remove the tool it has heretofore been necessary to use a drift pin or to drive the tool out, thus requiring the removal of the adapter from the spindle.

Under certain circumstances, it has also happened that a tool shank seated in the spindle for an extended period, often becomes frozen to the spindle, and removal therefrom is attended with great difficulty; and many firms, periodically remove, oil, and reset within the adapters.

I have overcome these disadvantages by providing an adapter with a short, abrupt, non-sticking taper and with, a locking drive cam which enters a recess in the tool shank to positively lock the tool shank therein; and I have provided a floating, spring-pressed seat which permits free rotation to facilitate alignment of the tool recess and the, cam locks, and prevents complete seating of the tool shank until the alignment is completed.- I have also limited the rotation of the lock. ing cam by providing a groove thereon which cooperates with the pilot stop of a set screw in the adapter, and thus prevents over-rota: tion of the loc 'ng cam in either direction.

My improved construction therefore permits ready interchangeability. of machine tools without removal of the adapter, and ensures proper seating and locking of the machine tool shanks in the adapter socket; and the following is a detailed description of one form of adapter which embodiesthe features of my invention.

Referring to the drawing, 10 designates the improved adapter, 7 spindle 11 of standard type, and locked in the spindle by means of the usual through bolt 12, which engages a screw threaded recess 13 in the inner end'of the adapter. As shown the tools to obviate this difficulty,

which is seated within a 1n the tool shank-29v of 14 for cooperating with the projections 15 of the s 'indle.

Consi ering Figure 1, it will be noted that the adapter 10 has a short tool shank receiving socket 16 with a sharp, nonsticking taper, preferably about 20 degrees. The socket l6 terminates in a cylindrical recess As will be noted in Figure 3, a recess 20 transverse to the socket 16 is positioned in the cad of the adapter, and houses a rotatable cam 21' shownin perspective in Figure 4. he cam has an operating stem 22, housed endof the cam is within which a pilot stop 26 of a set screw 2 secured in the adapter head seats, for limiting the rotarymovement' of the cam.

e cam, as shown inFigurel, is of spiral with a groove 25 a machine tool 30; thus serving as a locking drive cam. A bushv3.1 through which the set screw 27 passes, locks the cam within the transverse recess 20.

ows: The cam being in nonlocking tool shank of a mach the adapter socket.

position, the ine-tool is inserted in The end of the tool shank engages the-spring, and freely rotates .eing preventeduntil the alignment is completed; turning the cam then in a clockwise direction forces the cam also forces the tool shank rearwardlyto firmly seat 0 t e spring. The p11 overrunning of the cam t e operator. a s

It will thus be apparent that the improved adapter eliminates the st1cking"of tool shanks therein, and permits ready removal 1 therefrom, prevents the: freezing of tool shanks. therein, positively locks the toolshanks in firm seating enga-gement'with the adapter socket, insures pos tioning of the lock ng device position, and w in eitherlocking r unlocking has no. protruding 10h mayvendanger th -le I bodiment of e operators safety. I

tl0n of said 7 3. An adapter for machine tools having a .on said adapter e operation of my improved adapter isv f as foll ous to said socket, a cam on able into said socket into. the recess and in-the socket against the pressure: 0t end 26 prevents and indicates both the unlocked and the fully locked positions to bolt heads have disclosed one preferredj'ein my invention, it is obviousthat; various .changes in structure and arrangement maybe made, withinthe scopeofmy? invention as defined in the appended claims.

I claim:

1. An adapter for machine tools having a and a locking and driving element rotatably mounted and having a projection movable into said socket.

2. An adapter for machine tools having a tapered a plug mounted for rotation contiguous to said s0cket,and a cam extending from said plug and projectable into said socket on rotaplug.

a )lU mounted for rotation conti uous to saidsocket, a cam extending from said plug 7 and projectable into said groove.

5.7An adapter for machine tools having a tapered said plug projecton rotation of said plug, a groove on said plug of predetermined length, and a stop on said adapter positioned within said groove.

n adapter for machine tools having a tapered conical tool shank receiving socket,

a spring seat forming the base Of the socket,

a recess in said adapter,

mounted :1n said recess for face of the adapter.

8. An adapter for machine tools having a tapered conical tool-shank receiving socket, a-resilient seat forming a base for said socket,

a ockmg element rotatably mounted in the contiguous to said sock- ICE -- socket, a resilient seat inwardly of said socket and against the action of said seat.

9. In combination, an adapter for machine tools having a conical tool-shank receiving forming a base for said socket, a cam rotatably mounted in the Wall of said socket for projection into the socket, and a tool having a conical shank with an arcuate recess therein to receive said cam for urging said tool inwardly of said socket and against the action of said seat.

In testimony whereof I aifix my signature.

ARTHUR C. MAXFIELD. 

